Question

Consider the reaction N2(g)+3H2(g)→2NH3(g) , ΔH =−92.3kJ What will ΔH be for the reaction if it is reversed? Express your answer with appropriate units.

Answer 1

ΔH = +92.3kJ

Step-by-step explanation:

• A reversible reaction is a type of reaction that can proceed in a forward direction or in reverse direction.

In this case,

• An example of a reverse reaction is N₂(g) + 3H₂(g) ⇄ 2NH₃(g) ΔH = -92.3 kJ

• The enthalpy change of a reaction is given by subtracting the energy of the reactants from that of the products.
• Therefore, the enthalpy change of a forward reaction will differ from the anthalpy change of the reverse reaction with only the sign.
• If the reverse reaction is endothermic then the forward reaction is exothermic and vice versa.
• Therefore, if ΔH = -92.3 kJ for the forward reaction reaction, then the ΔH for the reverse reaction will be +92.3 kJ.